Actually we can. The US is a big customer. https://en.wikipedia.org/wiki/Kongsberg_Defence_Systems
> to develop its own weapons and airplanes.
This can be read in two different ways I guess, and ccsalvesens reply is a valid reply to the way I'd read your post, -namely that "Norway can neither make their own weapons nor their own planes".
You seem to have meant that Norway cannot develop both weapons && planes, true?
Just trying to clear out the source of the misunderstanding here.